Statistical modelling/Numbers of cattle
The variance components show that there was no significant variation among sub-regions, but there was some indication of differences between dip tank areas within sub-regions.
It should be noted, however, that we are making an assumption that the dip tank areas were selected at random, when in fact their selection was not strictly random; purposive sampling was involved in some cases as indicated under Study design.
**** REML Variance Components Analysis ***** |
Response Variate : log_cat_no
|
|
*** Estimated Variance Components ***
|
Random term |
Component |
S.e.
|
subregion |
0.0154 |
0.0173
|
subregion.diptank |
0.0341 |
0.0198
|
*** Residual variance model *** |
Term |
Factor |
Model |
Parameter |
Estimate
|
S.e.
|
Residual |
|
Identity |
Sigma2 |
0.442
|
0.0341
|
*** Wald tests for fixed effects *** |
Fixed term |
Wald statistic |
d.f. |
Wald/d.f. |
Chi-sq prob |
|
livst_inc2 |
6.03 |
1 |
6.03 |
0.014 |
|
|